Slant Six 225 Exhaust manifold question - need help

Thanks for all of your advice, I'm really gonna need it since I plan on replacing nearly all of the gaskets on the engine. I always had GM V-8's, got this car for my son and it seems simple, but not everything is as it seems... just like the gaskets, I would have just got the Fel-Pro kit and went from there. I may have to ask you guys for more advice once I start tearing down this engine.

By the way, only 39,000 original miles on the '64 Dart... actually owned by a little old lady from Tennesee